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Re: Filesystem won't mount because of "unsupported optional features (80)"

 > Filesystem features:      has_journal resize_inode dir_index filetype
			    64bit sparse_super large_file

 What could be causing this error and what does "80" refer to?

For some reason the 64bit feature is set in the filesystem.  This should
only be set for ext4dev filesystems.  Are you specifying this feature
yourself e.g. "mke2fs -O 64bit ..."?  Your filesystem is only 2.7TB so
you don't need the 64bit feature set and it doesn't really help you
unless you plan to expand the logical volume past 16TB.

Indeed, it appears that my initial assumption is correct. mke2fs contains ext4dev code and it erroneously applies the 64bit flag to filesystems > 2 TB by default. I confirmed this by creating a 1999G filesystem and it didn't get the 64bit flag. I then resized it 3000G, and luckily resize2fs doesn't contain this code or attempt to adjust the flags. The filesystem checked OK in fsck and is now mounting properly.

Maurice Volaski, mvolaski aecom yu edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University

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